Belting



May 28, 1946. w. LORD l-:rAL

BELTING Filed Feb. 25, 1944 1 ENToRS.

BY U

T//YEY Patented May 28, 1946 BELTING Wilfrid Lord, Rochdale, and HerbertRiding, Wilmslow, England, assignors to Dunlop Tire & RubberCorporation, Buffalo, N.` Y., a corporation of New York ApplicationFebruary 25, 1944, Serial No. 523,920 Y In Great Britain February 12,1943 4 Claims.

Our invention relates to belting consisting of a combination of woventextile fabric and rubber or the like, such as is employed in connectionwith conveyor, elevator or power transmission installations.

In the manufacture ofsuch belting it is the conventional practice toemploy a number of plies of woven fabric which arebonded together by anadhesive such as rubber or the like to form layers. The woven textilefabric provides the longitudinal strength of the belt and the principalanchorage means for the fasteners employed for joining together the endsof the belt.

The object of the present invention is to construct belting in which thewarp and weft threads of the woven textile fabric provide adequate lon'-gitudinaly belt strength with considerably en.- hanced fasteneranchorage and which requires less weight of textile material comparedwith conventional multiply belting.

A further object of the invention is to provide belting with greatlyincreased flexibility and endurance under flexing compared with that ofconventional multiply belting.

According to this invention belting which comprises a single ply oftextile fabric woven from comparatively coarse yarns or threads ischaracterised in that in the ply of woven-textile fabric:

(a) The weight of the fabric is not less than 45 ounces per square yard.

(b) There is not more than 420 yards per pound ofthe warp and weft yarn(maximum resultant cotton count of 0.5s.).

(c) The maximum number of weft threads is six per inch.

Note: The above particulars are ascertained when the textile material isin equilibrium with Standard Atmosphere as specified in the BritishStandards Institution Specification No. 1015/ 1942.

, The yarn from which the textile fabric is woven may be either plied orcabled yarns and may be composed of natural fibres or laments such ascotton, flax, hemp and silk or synthetic fibres or Fig. 3 is a sectionon line 3--3 of Fig. 1, In the embodiment illustrated in Figs. 1, 2 and3 the belting comprises warp threads I0 4and weft threads l I, therebeing approximately twelve or 5 thirteen '.varp threads per inch andbetween three and four weft threads per inch. The warp threads areclosely laid as indicated in Fig. 1. These threads are embedded in andcovered by a rubber composition I3 which binds and holds the threadsagainst displacement and forms a facing for the belting.

A comparison between conventional 5 ply belting and belting made with asingle ply of fabric according to the present invention is made in l5the following table of particulars and test data:

Beltilg made w1 conventional 32 Bvgge gunco according to yfitislf thepresent standard invention a. Number ol plies 1. b. Warp threads, totalnumber per l2. inch.

Count and ply- 7s/7.-. 3.75s/5/5. Yards per pound. 840 Y 126. c.Wththreads, total number per 65 3.

c Count and ply- 7s/6- 8.45/5/4/4. Yards per pound. 980 88. A d. Weightoi single ply oi fabric ounces/square yard.. 27.5 80. e. Total weight offabric in belt ounces/square yard.. 137.5 80. l. Ultimate longitudinaltensile strength oibelt..poundsperinch.. 1,800 1,900. a. Load requiredto pull out fasteners pounds per inch.- 810 1050. h. Ratio of loadrequired to pull out fasteners to ultimate longitudinal tensile strengthof beul-- 0.40-1 055:1.

i. Weave Plain Plain.

It will be seen that belting according to the present invention,compared with a conventional l5 ply belt, has one plv` instead of 5, has3 weft `threads per inch of belt instead of a total of 65, has a fabricweight of 80 ounces per'square yard instead of a total of 137.5 ounces,and has slightly greater longitudinal tensile strength` while the loadrequired to pull out the fasteners is 1050 pounds per inch instead of810 pounds.

In belting according to the present invention considerable saving inweight is eected for a given strength of belt or alternatively aconsiderable increase in strength can be obtained for a given weight oftextile material, as compared with a conventional multiply belt.

The improved fastener anchorage obtained by the use of the type offabric described allows the construction of a single ply belt ofadequate strength and failures common to conventional multiply belting,due to separation of the plies, are thereby' avoided. The greatlyincreased flexibility of such a single ply beltl is of decided advantageand permits the eicient use of belts on pulleys of smaller diameter thanis 'practicable with multiply belt constructions.

Furthermore, the impregnation with rubber or the like is more completelyeffected in the case of the textile fabric according to this inventionand the coarse texture provides a rough or broken surface which resultsin improved adhesion of cover rubber or the like.

'Ihe application of rubber to the single ply of textile fabric may beperformed by spreading, frictioning or topping in the manner commonlyemployed and well known in the art of rubber manufacturing processes.

Having described our invention what we claim 1. Belting comprising asingle ply of woven fabric having not over six weft threads per inch andin which the yards per pound of thread are not over 420 and the weightof the fabric is not less than 45 ounces per yard, and a coating ofrubber composition on said fabric.

2. Belting comprising a single ply of woven fabric having not over sixweft threads per inch and in which the yards per pound of thread are notover 420 and the weight of the fabric is not less than 45 ounces peryard, and a rubber composition impregnating said fabric.

3. Belting comprising a. single ply of woven fabric impregnated withrubber and having approximately twelve warp threads per inch andapproximately three weft threads per inch, the weight of said plyvbefore impregnation being eighty ounces per square yard, and the weftthreads having greater weight per yard than the warp threads.

4. Belting comprising a single ply of woven fabric having twelve warpthreads per inch and not over six weft threads per inch, the warpthreads having 126 yards per pound, said single ply of woven fabricbeing impregnated with a rubber composition.

WILFRID LORD.

HERBERT RIDING.

